Planets and stars, e.g

• Realms of influence
• Ball bearings, e.g.
• Celestial bodies
• Mars, Venus, etc
• Planet shapes, roughly
• Balls and bubbles
• Orbs
• Earth and moon, e.g.

Wiktionary Word definitions in Wiktionary
n. (plural of sphere English)

Wikipedia Word definitions in Wikipedia
The Synchronized Position Hold Engage and Reorient Experimental Satellite (SPHERES) are a series of miniaturized satellites developed by MIT 's Space Systems Laboratory for NASA and US Military, to be used as a low-risk, extensible test bed for the development ...